Slides in this set

Slide 1

Slide 2

Where did life on Earth come from?All life on Earth ( including all extinct species) haveevolved from very simple living things.Life began about 3500 million years ago.…read more

Slide 3

Evidence for evolutionThis evidence is from : fossils DNA evidence The more similar the DNA is, the more closely related the living things are.…read more

Slide 4

The first living things needed to be molecules thatcould copy themselves ­ so offspring could beproduced.Some scientists think these molecules formed on Earthdue to some extreme conditions at the time.Other scientists believe these molecules came fromelsewhere in the universe via a meteorite / asteroid.…read more

Slide 5

If at any time the conditions on Earth had beendifferent, then all living things would be different (because all living things that survive are well adapted totheir environment)…read more

Slide 6

Variation This is the ways in which living things are different from each other.Variation can be caused by :Genes (passes from parents to offspring)Environment (changes during the organisms lifetime)Most variations are due to BOTH(height, weight, skin colour)…read more